24ABR
Baset Series Air Conditioners
Sizes 18 To 60
1 --- 1 / 2 To 5 N o m i na l To n s
Installation Instructions
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2.......................
INSTALLATION RECOMMENDATIONS 2.............
INSTALLATION 3--10..............................
Step 1 -- Check Equipment & Jobsite 3...............
Step 2 -- Install on Solid Pad 3......................
Step 3 -- Clearance Requirements 3..................
Step 4 -- Operating Ambient 3......................
Step 5 -- Install TXV 3 -- 4.........................
Step 6 -- Make Piping Connections 4 -- 7..............
Step 7 -- Make Electrical Connections 7 -- 8............
Step 8 -- Compressor Crankcase Heater 8.............
Step 9 -- Install Electrical Accessories 8..............
Step 10 -- Start--Up 8 -- 9...........................
Step 11 -- Check Charge 10.........................
Step 12 -- Final Checks 10..........................
CARE AND MAINTENANCE 10......................
A05341
F i g . 1 --- 24ABR*
*Shown with dense coil guard option
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause death, personal injury, or
property damage. Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The
qualified installer or agency must use factory-- authorized kits or
accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes
and National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words; DANGER, WARNING, and CAUTION.
24ABR
These words are used with the safety --alert symbol. DANGER
identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are
appropriate for unit capacity.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal
opening with RTV or other pliable silicon--based caulk.
(See Fig. 2.)
6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs
with a rigid wire or strap which comes in direct contact
with tubing.(See Fig. 2.)
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide
and conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal
sleeves bent to conform to shape of insulation.
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
LIQUID TUBE
VAPOR TUBE
JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1” MIN.
SUSPENSION
INSULATION
VAPOR TUBE
LIQUID TUBE
A94026
F i g . 2 --- Piping Installation
Outdoor unit contains system refrigerant charge for operation
with ARI rated indoor unit when connected by 15 ft. of
field--supplied or factory accessory tubing. For proper unit
operation, check refrigerant charge using charging information
located on control box cover and/or in the Check Charge section
of this instruction.
IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all
residential applications including long line.
IMPORTANT: Always install the factory--supplied liquid--line
filter drier. If replacing the filter drier, refer to Product Data
Digest for appropriate part number. Obtain replacement filter
driers from your distributor or branch.
2
INSTALLATION
STEP 1 —Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton taking care not to damage
unit.
Equipment
Inspect
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
STEP 2 —Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig.
3 to determine base pan size and knockout hole location.
For hurricane tie downs, contact local distributor for details and
PE (Professional Engineer) certification, if required by local
authorities.
On rooftop applications, mount on level platform or frame. Place
unit above a load--bearing wall and isolate unit and tubing set
from structure. Arrange supporting members to adequately
support unit and minimize transmission of vibration to building.
Consult local codes governing rooftop applications.
Roof mounted units exposed to winds may require wind baffles.
Consult the Application Guideline and Service Manual -Residential Split System Air Conditioners and Heat Pumps for
wind baffle construction.
NOTE: Unit must be level to within ±2_ (±3/8 in./ft.) per
compressor manufacturer specifications.
STEP 3 —Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30--in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a
6--in. clearance on 1 side of unit and 12 in. on all remaining sides
must be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
3/8 ---in . Dia. Tiedown
Knockouts in Basepan
(2) Places
STEP 4 —Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55_F, and the maximum outdoor operating ambient in cooling
mode is 125_F.
STEP 5 —Install TXV
NOTE: Applies to non--TXV and Puron TXV indoor units
only. If installing a rated and approved indoor coil without a
factory installed R--22 TXV, remove and replace the fixed orifice
or PuronR TXV expansion device with an R--22 TXV.
The thermostatic expansion valve is specifically designed to
operate with R--22. Do not use a PuronR TXV. An existing
PuronR TXV must be replaced with a factory--approved TXV
specifically designed for R--22. Refer to Product Data Sheet for
the appropriate TXV kit number.
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
All indoor coil units must be installed with a hard shut
off R-- 22 TXV metering device.
IMPORTANT: If not factory installed, the TXV should be
mounted as close to the indoor coil as possible and in a vertical,
upright position. Avoid mounting the inlet tube vertically down.
Valve is more susceptible to malfunction due to debris if inlet
tube is facing down. A factory--approved filter drier must be
installed in the liquid line.
Installing TXV in Place of
1. Pump system down to 2 psig and recover refrigerant.
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
3. Remove and discard factory --installed piston. Be sure
Teflon seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE: If the piston is not removed from the body, TXV will
not function properly.
CAUTION
Piston
24ABR24ABR
View From Top
UNIT BASE PAN
DIMENSIONS
26 X 26 9–1/8 4–7/16 21–1/4
31–1/2 X 31–1/2 9–1/8 6–9/16 24–11/16
35 X 35 9–1/8 6–9/16 28–7/16
F i g . 3 --- Tiedown Knockout Locations
On rooftop applications, locate unit at least 6 in. above roof
surface.
TIEDOWN KNOCKOUT LOCATIONS
A B C
A05177
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Use a brazing shield and wrap TXV with wet cloth or
use heat sink material.
5. Install TXV on indoor coil liquid line. Sweat swivel
adapter to inlet of indoor coil and attach to TXV outlet.
Use backup wrench to avoid damage to tubing or valve.
Sweat inlet of TXV, marked “IN” to liquid line. Avoid
excessive heat which could damage valve.
6. Install vapor elbow with equalizer adapter to suction tube
of line set and suction connection to indoor coil. Adapter
has a 1/4--in. male connector for attaching equalizer tube.
7. Connect equalizer tube of TXV to 1/4--in. equalizer fitting
on vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line
using clamps provided. Insulate bulb with field--supplied
insulation tape. See Fig. 4 for correct positioning of
sensing bulb.
9. Proceed with remainder of unit installation.
3
CAUTION
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